Ti-Ni-Nb alloy device
Active Publication Date: 2009-03-12
TOKIN CORP +1
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Benefits of technology
[0029]According to this invention, it is possible to provide a Ti—Ni—Nb alloy device which is a shape memory device excellent in response characteristics.
Problems solved by technology
As well as the above-mentioned merits, such superelastic stent has several demerits, such as occurrence of damage in the blood vessel wall, a positioning error in placement, lack in deliverability, and so on due to its spontaneous shape recovery characteristic.
Therefore, it is difficult to use the superelastic stent in a blood vessel system such as a coronary system.
However, there are problems that the applied strain is large and that the operating sensitivity is low.
Therefore, practical application is not yet realized.
However, there is left a problem that a pressing force (expanding force) against a lumen wall after expansion is weak.
This stent exhibits superelasticity at the living body temperature after it is released from the catheter but does not sufficiently solve the above-mentioned problem (arbitrariness in positioning) as required in PTCA.
However, problems are left in shape recovery characteristics after application of strain and adaptability to a slot shape.
Method used
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Embodiment Construction
[0031]Now, an embodiment of this invention will be described.
[0032](a) At first, alloy compositions and strain application will be described.
[0033]A Ti-50 at % Ni alloy depicted at No. 1 in Table 1, a Ti-48.5 at % Ni-32 at % alloy depicted at No. 2, a Ti-47 at % −6 at % alloy depicted at No. 3, a Ti-42 at % Ni-9 at % alloy depicted at No. 4, and a Ti-42 at % −15 at % alloy depicted at No. 5 were subjected to high-frequency induction melting, hot working, and cold working to obtain wires having a diameter of ø 1.0 mm. Each wire was heat treated at 400° C. for one hour. Thereafter, an elongation strain ε=0-15% was applied and then a load was released. For each test piece, transformation temperatures were measured. A temperature difference (ΔT) from a reverse transformation start temperature to a reverse transformation finish temperature was obtained as a shape recovery sensitivity. The result is shown in Table 1.
[0034]As shown in Table 1, a comparative alloy No. 1 had a shape recovery...
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Abstract
To provide a Ti—Ni—Nb alloy device which is a shape memory device excellent in response characteristics.The Ti—Ni—Nb alloy device is made of a Ti—Ni—Nb alloy which finishes transformation at a temperature lower than 10° C. after start of reverse transformation.
Description
TECHNICAL FIELD[0001]This invention relates to a shape memory device excellent in response characteristics to an external environment temperature and, in particular, to a high-temperature operating device required to operate at a temperature not lower than 100° C. and a biomedical material.BACKGROUND ART[0002]As well known, a shape memory alloy, such as a Ti—Ni alloy, exhibits a remarkable shape memory effect in association with martensitic reverse transformation. Further, the shape memory alloy exhibits excellent superelasticity in association with stress-induced martensitic transformation induced by strong deformation in a parent phase after the reverse transformation. The superelasticity is observed in a number of shape memory alloys and, among others, is particularly remarkable in the Ti—Ni alloy and a Ti—Ni—X alloy (X═V, Cr, Co, Nb, or the like).[0003]The shape memory effect of the Ti—Ni alloy is disclosed in Patent Document 1. The superelasticity is disclosed in Patent Documen...
Claims
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Login to View More IPC IPC(8): C22C14/00C22C30/00A61F2/82A61L31/00A61M29/02C22C1/00C22C19/03C22F1/00C22F1/10
CPCA61L31/022A61L31/14A61L2400/16C22C1/00C22F1/10C22C19/03C22C30/00C22F1/006C22C19/005
InventorOZAWA, MICHIHIDEYAMAUCHI, KIYOSHISUTOU, YUJITAKAGI, TAKAMITSUYAMASHITA, SHUZOUMORI, KOUJI
OwnerTOKIN CORP